The Moon Rocks On

As every 9-year-old knows, the moon is dead. Textbooks say that volcano's, geysers and other signs of geological activity ended a billion years ago. Not so fast, says Peter Schultz, an astronomer at Brown University. He and colleagues report in the journal Nature that water and carbon dioxide still leak out of surface cracks--a sign of underground heat. The moon's landscape continues to change, and not just from meteorites. --Monique Mugnier